KR-7400 with a constant hum in both channels

Well that was easy. Qe24 is shorted every way possible and Qe22 is shorted E<-->C. Looks like I'm replacing the outputs. Anyone have any tips on getting at them? Does the whole heatsink assembly have to be removed?
 
The previous link I'd posted, is a drop in replacement ... lead spacing being the only question. Alternately, you could drop a couple pairs of these in there. The metal frame on the factory unit is a heat sink and the Mouser substitutes are so much overkill, you won't need a heat sink.

+1 600V 30A FREDs More than suitable, and a simple option for replacement. These original packages rarely fail though.
 
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